Drilling-machine



(No Model.)

T. PORSTNER.

DRILLING MAGHINE. No. 494,632. Patented Apr. 4, 1893.

NITED TATES THOMAS FORSTNER, OF

DRILLING- NEW ULM, MINNESOTA.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 494,632, dated April 4,1893.

Application filed October 6,1892.

To all whom it may concern.-

Be it known that I, THOMAS FORSTNER, a citizen of the United States,residing at New Ulm,in the county of Brown and State of Minnesota, haveinvented certain new and useful Improvements in Drilling-Machines; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to machines for drilling or boring particularlymetal, although the same may be also employed for operating on othermaterial, such as Wood and the like.

The object of my invention, among other things, is to provide a machinein which the work, or material to be drilled will automatically andreadily follow up the drill as the drilling proceeds and in which thepressure of the work against the drill-bit can be adjusted as desired soas to regulate the speed of the drilling or boring operation accordingto the character of the work.

It is also my object to provide means whereby the work can be readilydisengaged from the drill or boring-bit, as soon as the drilling orboring operation is completed. For this purpose a machine embodying myinvention consists essentially, in a rotary drill, in com bination witha work-table or platform adapted to slide longitudinally with relationto the drill and yieldingly held up against the drill by a spring whosetension may be adjusted according to the character of the work. Thiswork-table is provided with means for withdrawing it from the drillagainst the stress of the spring, when the work has been completed, thatis to say, when a hole or mortise has been drilled. And myinventionconsists in such other details, features and combinations of parts aswill be hereinafter described and covered in the claims.

In order to more clearly explain the nature of my invention to thoseskilled in the art, reference is made to the accompanying drawings, inwhich Figure 1 represents a front elevation of a drilling or boringmachine embodying my invention; Fig. 2 a vertical central section of thesame; Fig. 3 a side elevation, and Fig. 4

Serial No. 448,046. (No model.)

a transverse horizontal section on line 3-3, Figs. 1 and 2. P

In all the figures the same letters designate the same parts.

In the drawings, A, represents a standard, rising from the base B, ofthe drilling machine. The said standard carries all the working parts ofthe machine.

The drill proper, O, is mounted in brackets, c, c, screwed to orotherwise secured to the standard, A, as shown, and consists in aspindle, o, passing through a stationary sleeve 0 secured between thetwo' brackets, c, c, and provided at its lower end with a drill-head orsocket-piece, 0 into which the various drillbits, 0 may beinterchangeably secured, in any usnal'or convenient manner, 6. g. by theset-screw, c, as shown. The upper end of the drill-spindle, O, isprovided with a bevel-pinion, c meshing with a bevel-gear, D, suitablyjournaled in the standard, A, as shown, and to whose shaft, d, a crank,d, is'secured. Or a pulley may be keyed to the shaft, d, and derive itspower by a belt from any suitable motor.

Below the drill is arranged the longitudinally movable work-table, orbed-plate, E, which is yieldingly held up against the drill, preferablyin the manner shown in the drawings, which will now be described. Theworktable preferably consists of the center or guide block, e, adaptedto engage and slide in a vertical guide-slot, a, in the standard A. Attop and bottom of the guide-block, e, are attached the four horizontalblocks, e, 6 ,6 e which serve to hold the work-table in properhorizontal position, and the first of which, e, constitutes thework-table proper. In order to yieldingly hold the work, placed ontable, E, against the drill so as to follow the same up as the workproceeds, I suspend the said Work-table from a fixed bracket, a, by arod F, yieldingly connected to the same, e. g. by passing looselythrough the block, 6 and provided at its lower end with a head orwasher, f, between which and the block, 6 is arranged a helical or otherspring, f, which has a tendency to yieldingly force the table, E,upwardly against the drill O. In order to regulate the pressure withwhich the work is forced against the drill, I screw-thread the upper endof the suspension rod F at f and thread onto this end a thumb-nut orscrew wheel, f which rests on the bracket, a. The upper end of rod, F,of course passes loosely through the said bracket, a. In order towithdraw the work from the drill-bit, 0 when a hole has been drilled orfor any other purpose, I pivot a lever or treadle, G, to the standard,at g, and connect the same with the work-table, E, by a link, g, orotherwise. In order to overcome friction in the longitudinal movement ofthe work-table along standard A, and to prevent the said work-table frombinding against the standard A, I provide the same at suitable pointswith anti-friction rollers H, preferably arranged as shown, that is tosay, two rollers, H, at the top in the block, e on opposite sides of theslot, a, and two rollers, H, at the bottom on the opposite side of thestandard, A, and also arranged respectively on opposite sides of slot,a.

The operation of the drilling machine thus shown and described, isobvious from the foregoing. WVhen it is desired to drill a hole or amortise into a piece of metal, the worktable, E, is depressed againstthe tension of spring, f, by depressing treadle, G, and the work is thenplaced in the desired position on the table. The treadle is thenreleased and the drill is caused to rotate by turning the crank, d, orin any other desired manner. As the drilling proceeds the spring,f',urges the table E, upwardly causing the work to follow up the drill. Inorder to increase or diminish the rapidity of the drilling operation thepressure of the table upwardly is varied by turning the screw-wheel,f inone or the other direction.

While I consider the machine thus shown and described the bestembodiment of my invention, it is manifest that the same may beconsiderably modified in many particulars, without departing from thespirit of my invention, and I do not therefore desire to be limited tothe exact details described, but

What I claim, and desire to secure by Letters Patent, is

1. In a drilling-machine, a drill, mounted in a standard, in combinationwith a worktable, a suspension-rod passing from a fixed part of thedrill-standard to the work-table and a spring interposed between theworktable and the end of the suspension-rod, substantially as set forth.

2. In a drilling-machine, a standard, a drill mounted thereon, incombination with a worktable, a suspension rod passing from a fixedpoint on the standard loosely through the work-table and provided with awasher at its lower end, and a spring interposed between the washer andthe work-table, substantially as set forth.

3. In a drilling machine, a standard, a drill mounted therein and abracket, as a, fixed thereto in combination with a work-table, asuspension rod passing loosely through the bracket and the work table,and provided at its lower end with a washer, a spring inter posedbetween the washer and the work-table and a screw-wheel threaded on theupper end of the suspension-rod, substantially as set forth.

4t. In adrilling machine, asingle drill-standard in combination with awork-table enga ing the standard, anti-friction rollers mounted inopposite sides of the work-table and bearing against the standard andmeans for moving the work-table longitudinally on the standards,substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS FORSTNER.

Witnesses:

O. A. HAGLING, I. M. OLSEN.

